Orbits 3.0: Voyage Through The Solar System

I used this more than 20 years ago and read all the entries and marveled at all the animations and diagrams. It used the modest computer capabilities of the time (DOS era, don't forget) very well, showing how better a PC could be than a book for teaching scientific concepts. It still is a good read, although somewhat dated (this was before exoplants were found, for instance).I endend up losing it and even forgot its name but after asking for help in a few places, I finally found out the name. Amazingly, for a DOS/Win95 era software, there are still some copies for sale. If you like Astronomy, I recommend it.